变速恒频风力发电系统谐波研究及抑制策略

由于风力发电系统双馈发电机大都采用交-交变频器励磁,因此转子电压中不但含有转差频率的基波电压,同时还含有大量的零序、正序和负序谐波分量。通过对采用交-交变频器励磁的风力发电系统所产生的电力谐波进行研究,计算出基波电压分量和各次正、负序谐波电压分量所引起的基波、谐波电流、转矩、功率和损耗等。并进一步给出了适用于该励磁系统电力谐波的3种可行抑制策略。经分析,其中适用于变频恒速发电系统的最合理谐波抑制策略应该选择在转子侧进行,并合理运用有源和无源滤波器。

Harmonic Research and Inhibit Strategy of Variable Speed Constant Frequency Wind Power System

Because of wind power systems doubly-fed generators mostly adopts the hand over, the rotor voltage not only contains base wave voltage of slip frequency, but also contains a lot of zero sequence,positive sequence and negative sequence harmonic component. Through researching electricity harmonic which is created in wind power system of hand over inverter excitation, and calculating the base wave voltage components and the base wave,harmonic current, torque, power and loss, etc, which is caused by positive and negative sequence harmonic voltage component.And three kinds of the harmonic inhibit strategy in the power system further is given. Though analyses, one of the most reasonable harmonic control strategy should be choosen in the aspect of the rotor,with using the side of active and passive filter.